Arrangement of means for regulating the draft in steam-boilers



UNITED STATES PATENT Fries,

PLINY E. CHASE, OE PHILADELPHIA, PENNSYLVANIA.

ARRANGEMENT 0F MEANS FOR REGULATlNG-THE DRAFT IN STEAM-BOILERS.

Specification forming part of Letters Patent No. 15,870, dated October 14, 1856.

act description thereof, reference being had to the accompanying drawings, making part of this specification, in Which- Figure l represents a perspective View of the apparatus; Fig. 2, a vertical section inthe line w x; Fig. 3, a horizontal section in the line y e, andFig. 4 a perspective view of the damper a.

The letters of reference indicate the same parts in the different gures.

The following is a description of the construction and arrangement of the different parts.

The boiler B may be of any convenient form.r F is the fire-box, surrounded by the boiler on its sides and top, leaving an intermediate space II between the tire-box and boiler partially closed at the top by the curved plate I.

S is the smoke-flue, connected with the annular space H by the flue L and with the ashpit A by the flue L.

C is a vertical cylinder, open at the top, connected by a bent tube with the boiler B, bcloW the water-line. It contains a float f, which carries a horizontal arm h.

K is a drum or enlargement of the smoke-Y lue, for the purpose of collecting and radiating the escape-heat.

E is the steam-main, through which the steam is conveyed for distribution through pipes or radiators in the apartments to be warmed.

A pipe D, open atthe bottom in the boiler below the proper water-line, extends upward through the top of the boiler. Itis bent over and descends outside of the boiler, then passes through it and enters the tire-box F. Another pipe w, opening at the bottom in the boiler above the water-line, extends upward through the top of the boiler and enters D. It is provided with a safety-valve fu, weighted to yield only to the maximum pressure at Which the steam is intended to be used. Attached to the top of the valve f1; is a lever of the second kind, having its fulcrum at t, its arm c being kept in position upon the top of the iloatf by the arm 7L and upright 0.

N is an opening which admits the airto the lire-box F, through the ash-pit A and grate G.

a is a damper or valve which occasionally closes the opening` N, by thesame act opening the flue L. It is operated by a crank-rod d, which has iianges or projections e, their respective planes forming an obtuse angle with each other, and thek damper is attached to the rod by staples which admit of a limited motion of the damper on the rod. The object of this arrangement, in connection with the weighted lever t" and the counter-balance t', is to allow of a greater movement being given to the damper than to the rod itself. A similar damper b is placed in the flue L andv operated by the crank-rod r. The cranks d and r are connected by a chain s to each other and with the arm 7i, and are so arranged that when one flue is opened the other will be closed.

The operation of the apparatus is as follows: Then the boiler is cool the damper a is closed. Air enters at N and passes through the rebox, rapidly increasing the combustion of the fuel. The flame, smoke, and heated gases are forced over the upper edge of the lire-box F, and, being prevented by the curved plate I from passing directly into the flue L, circu-V latein the space II, giving olf their heat to the extended surface of the boiler .and rapidly generating steam. VAs the pressure of the "steam increases it causes the water to rise in O, elevating the float f, which, by its connection with the dampers CZ and a, closes the opening N, and the iiue L, at the same time opening the flue L. The draft will thus be reversed. The heated products of combustion will be drawn from the annular space I-l and the surface of the boiler down through the tirebox and flue L and their place be occupied by cool air, which will enter through the seams of the iiue L or through apertures made forthat purpose, thus reducingthe temperature of the boiler and consequently the head of steam. At the same time the float f elevates the arm of the lever c, opening the safety-valve and causing the steam to rush through the pipe D into the fire-box F and aid in reducing the lire. When the desired effect has been accomplished, the iioat f falls and the draft is again reversed, resuming its original course; but if from any cause the iioat f should not act or the contrivances operated thereby prove insufficient, and the pressure of steam should increase beyond the fixed limit of safety, the Water will rise high enough in the tube D to passits bend and descend from thence into the fire-box, and thus etectually extinguish the iire. The valve fu also acts as a safety-valve independent of the float. The supply of Water to the boiler can be regulated by any convenient mode, the heat radiated from the drum K, andthe Whole apparatus can be conveyed where required for Warming purposes.

Having thus fully described my improvement, WhatI claim as my invention and desire The apparatus, substantially as herein described, when constructed and arranged so that the action of the steam in the boiler B, whenat or above the maximum pressure desired, will cause the draft through the fire-box F to be reversed and pass down through the tire, and again resume its former course in the opposite direction when the pressure is reduced to the minimum, for the purpose herein specified.

In testimony whereof I have signed my name to this specification before tWo subscribing Witnesses.

PLINY E. CHASE. Witnessesr GEO. WV. OSLER,

to secure by Letters Patent, is`

C. BRAZER. 

